What is TIR?
How does TIR occur?
What is the equation for TIR?
What is TIR used for?
What is the critical angle?
What density conditions need to be met for TIR to occur?
What angle conditions need to be met for TIR to occur?
What happens when TIR occurs, if you are standing on the other side of the medium?
What material has a refractive index of one?
What actually makes the light reflect back perfectly?